Question

Find the area of the circle to find the nearest whole number. Use 3.14 or 22/7 for ip

Answer 1

You didn't provide the complete question as the radius or diameter of the circle isn't given. Please check the explanation below to see how to approach such questions.

Explanation:

Area of a circle has a formula and it is given as:

Area =
`\pi r^(2)`

where
`\pi` is a constant and has a value of 3.14 or 22/7,

r is the radius of the circle (i.e the line drawn from the center of the circle to any point on the circle).

radius, r = diameter/2.

Example 1: Find the area of a circle with radius 7meters (7m) and correct to the nearest whole number. Use 3.14 or 22/7 for pi.

Solution:

`Area = \pi r^(2) = (22)/(7) (7^(2))\\\\ Area = (22)/(7) (7)(7) = 22(7)\\\\ Area = 154squaremeters = 154m^(2)\\`

NB: The unit of area is always in square units. In our case square meters

Example 2: Find the area of a circle with diameter 7feet(7ft). Use 3.14 or 22/7 for pi.

Solution:

`Area = \pi r^(2)`

But we were given the diameter not the radius.

Remember that I earlier said that radius, r = diameter/2 =
`(7)/(2)ft`

`Area = (22)/(7)((7)/(2) )^(2) = (22)/(7) ((7)/(2) )((7)/(2) )`

`Area = (11(7))/(2) = (77)/(2) \\\\ Area = 36.5ft^(2)`

So, if you have questions that ask for area, ensure you have the radius and if the diameter is given instead of the radius, carry out the neccessary calculation i.e. Diameter/2 to obtain the radius and use the area formula.